It's unusual to find character LCD's larger then 20x4 because the most common LCD control chips can support only 80 characters. For larger displays they sometimes use two controller chips on one LCD making 40x4 a fairly common size.

I have had great luck with the Itead 3.2 displays (320X240) with an 8X8 character that is 40 X 30 lines, they can be had from Electrodragon, last time I bought one it was $16.50 and the Mega shield was $6.00 I also have a couple of the 2.4" displays and they work about the same. The library that I use is Henning Karlsen's UTFT Lib and it seems to be well thought out and versatile. I have one of each in front of me now, the 2.4 running a modified demo from the UTFT package and the 3.2 is running a GPS clock. The only real issue is that "natively" they are resource hungry (use a lot of I/O) which could likely be reduced with shift registers if an Uno was what you need to use. Mine are both on Mega's and one is on a 20 cm long 40 conductor M/F cable so I can access the board under the GLCD to connect the GPS receiver and the rest of the project as I develop the modules for it.

Bob

--> WA7EMS "The solution of every problem is another problem." -Johann Wolfgang von GoetheI do answer technical questions PM'd to me with whatever is in my clipboard